Piston pins. why not free?

They are

Level 1 Prep
h. Pistons and Connecting Rods
1. Pistons, pins, clips and/or pin retainers and piston rings are unrestricted. Pistons must be constructed of metal.

Level 2 Prep
h. Pistons and Connecting Rods
1. Pistons, pins, clips and/or pin retainers and piston rings are unrestricted. Pistons must be constructed of metal.
2. Alternate ferrous connecting rods, of the same crank pin center to piston pin center dimension and crank pin and
piston pin bore dimensions as stock, are permitted.
3. Connecting rod bolts and nuts are unrestricted.
 
Can't you just run a larger bushing on the rod, and leave the piston pin the same diameter, if you've had some issues with pin / rod wear?
 
Bushings can be installed where none are fitted as stock,
provided they are concentric, and that the centerline of the
bushed part is not changed.
Click to expand...

Pin size is free. As long as you keep the pin bore the same size as stock in the rod. Bushings are free so you can use any size bushing to allow for a smaller pin. Was your engine blessed with some oak tree size pins or something?
 
Mike is investigating the feasibility of mounting the intake manifold heat shield and the air dam to his piston pins...

I plan to protest based on moving aero devices...

j/k, Happy New Year!

Al Seim
 
Yep pin diameter size is free, has been for decades, people have been doing that for years. I have been using using .750", and .630 pins in LBC motors for years, stock most are .812", the exception being the 948s, and 1098s which came with .625" pins stock, which in their case, none of aftermarket piston companies even make a .625" pin anymore, so you would use the .630". Yes, this is old news.
 
You must log in or register to reply here.
Back
Top